The assessment, carried out by the Great Barrier Reef Marine Authority (GBRMPA) and Queensland Parks and Wildlife Service, surveyed 36 reefs or some 300km of the 2,400 km-long reef that makes up the popular tourist site, which contributes billions of dollars to Australia's economy annually. -- PHOTO: REUTERS SYDNEY - POWERFUL cyclone Yasi caused patchy but severe damage to Australia's famed Great Barrier Reef when it tore through last month, with some areas little more than rubble, scientists said on Monday. But while pockets of centuries-old coral was destroyed and recovery may take decades, most of the damage was confined to areas with so little tourism that many of the reef sites don't even have names, with major areas spared. The assessment, carried out by the Great Barrier Reef Marine Authority (GBRMPA) and Queensland Parks and Wildlife Service, surveyed 36 reefs or s...